NoMethodError: undefined method `[]' for nil:NilClass

[dblock]

E, [2019-04-18T20:06:03.984531 #232] ERROR -- : NoMethodError: undefined method `[]' for nil:NilClass
  /app/vendor/bundle/ruby/2.6.0/gems/iex-ruby-client-0.4.4/lib/iex/errors/client_error.rb:8:in `initialize'
  /app/vendor/bundle/ruby/2.6.0/gems/iex-ruby-client-0.4.4/lib/iex/resources/base.rb:9:in `exception'
  /app/vendor/bundle/ruby/2.6.0/gems/iex-ruby-client-0.4.4/lib/iex/resources/base.rb:9:in `raise'
  /app/vendor/bundle/ruby/2.6.0/gems/iex-ruby-client-0.4.4/lib/iex/resources/base.rb:9:in `rescue in symbol'
  /app/vendor/bundle/ruby/2.6.0/gems/iex-ruby-client-0.4.4/lib/iex/resources/base.rb:4:in `symbol'
  /app/vendor/bundle/ruby/2.6.0/gems/iex-ruby-client-0.4.4/lib/iex/resources/chart.rb:10:in `get'

[dblock]

Was transient, but still.